Automatic drain-valve.



C. W. NEWCOMBE.

-AUTOMATK; DRAIN VALVE, APPLlCATlON FILED JULY m, was.

1,226,? 96. Patented May 22, 1917.

is I

CHARLES W. NEWCOMBE, 0F TACOMA, \VASHINGTON.

To all whom it way concern:

Be it known that 1, CHARLES W. Newooinu-i, citizen of the United States, and resident (if-Tacoma, Pierce county, State of Washington, have invented certain new and useful Improvements in clutomatic Drain- Valves, of which the following is a specification. I My invention relates to drain valves designed for application to steam engine cylinders and other containers,which at times contain steam and which it is desired to have drained of water when the pressure is removed.

The object of my invention is a device of simple construction, which shall be automatic in its action, which is re liable and prompt in action and which will thoroughly drain, not only the chambers with which it is connected, but itself, so that no water. of any amount can remain therein for freezing v Myfinvention comprises the novel features of construction which will be herein described and then particularly pointed out in the claims.

In the accompanying drawings I have shown my invention in the type of construc 1 tion which is now preferred by me.

Figure 1 is a central longitudinal action.

Fig. 2 is a cross section taken on t 1e in'e 22 of Fig. 'l.

Fig. 3 is a section lengthwise the piston. The outer or casing memor 1,015 my device,'is bored from one end to form. a chamher for the reception of the inner end of casing.

inner end of the casing.

plug member 2. Thesev two members .are

secured by threading the plug within the Jhe,inner end of the plug preferably seats on a shoulder Casing 1 is provided with a high pressure inlet 10, to which the high pressure pipe 14L is connected. It is also provided withtwo low pressure ports 11 and'12, with which pipes15 and 16 are connected. latter ports are at the sides of the casing, while the high pressure connection is at the end thereof. While I have shown and will describe, only two low pressure connections with the ea,sing,f1t s evident that more may be provided, if desirril.

The. inner end of the plug 2 is bored to TOIlIt/it piston-valverreceiving chamber 20,

in which the piston valve 3 fits to form a snug, but freely sfilding fit. The plug is Specification of Letters Patent. Application filed July 10, 1916. Serial N0. 108,523.

the closing spring to provide the grooves 31, when 13 formed .at the 2 These.

spring 4; will act to raise Patented May 22, 1917.;

low pressure inlet ports 21 and 22, which, when the plug is seated in place, register with the low pressure inlet ports 11 and 12, of the casing. Their inner ends open withinthe bottom face of the piston-valverreceiving chamber 20' and inward a short distance from the periphery thereof. The piston valve 3 is recessed to receive t and the discharge or drainage outlet 23 is large enough to receive the same spring,=and has a ledge 2 L against which the spring bears.

The piston valve 3 is provided with grooves 31. extending across its periphery and connecting opposite sides thereof. It is also provided with grooves 81 with the chamber 25iat the upper end of the casing. These ports, as here in shown, consist of recesses 30 which connect with the grooves 31 and extend inward toward the center. somewhat of the character. of the teeth formed upon an end-faced mill or cuttei. They may, however, beof any convenient type of construction. passing through the valve will. impinge upon the axial faces thus produced to give the piston valve a slight turning movement.

With high pressure steam acting upon the upper surface of the piston valve 3, it will be forced down and seated upon the bottom of the chamber 20, thereby closing the ports 21 and 22, as the ports 21 and 22 are located provided with sutliciently inward from the outer margin of this head as to not be in communication with seated. f

' If, during this condition, an excess pres sure should be suddenly developed in either of the chambers with which pipes 15 and 16 are connected, this excess pressure, communicated through these pipes to the ports 21 or 22,1as the case may be, would lift the piston valve and permit discharge of this excess pressure through the discharge channel 23 and the pipe 17 connected therewith. As soon as this excess pressure is released the high pressure, acting through pipe 14, will immediately seat the valve. d

When the high-pressure communicated through pipe 14 is cut off or relea ed, the the piston valve, The low pressure pipes 15' and 16 ,are thus placed in communication with the" discharge pipe 17 as is also the high pressure pipe 14} through the recesses 30 andgrooves 31.

Steam 01' water WilQll' the piston valve is" ports connecting these 7 These, as shown, are

What I claim as my invention is:

1..In a drain valve, 1n combination, an

outer casing member having a high pres-- sure port in its head and low pressi-ireport 5 ii -its sides, a plug or closinginner men'iber having a piston chamber recessed into 1ts from said piston chamber lo pressure ports of the casing, a piston in extendsaid clizimber haying by-pass ports mg across itsp'eriphery from face its face which toward the high pressure port, and a springacting to force the fpis- -ton toward thehigh pressure port.

2. In a drain valve, n combination, an 20 outer casing cylmdrlcally bored from one w p to face 15 and extending thence toward the center of end, and having a -high pressureiport in its head and low pressure ports at lts sides, an

inner member fitting the herein the casing and having its inner end bored to form a piston-receiving. chamber and having adischarge port extending from-the bottom of said chamber to its outer end'and lowpressure ports extending from the bottom of said chamber and communicating with the low pressure ports in the casing a piston valve fitting sa d chamber and having by-pass channels in its periphery extending from face to face and communicating channels in high pressure 'face extending toward the center, and" fromthe bottom or the chamber.

Signed at eattle, \Vashingtori,

day of June, i916. h v,

- CHAR-HES W. NEWCOMBE,

this 30th aspring seated in the dischargeport and acting to hold the PlStOIL away- 

